It is odd really why Mankind has evolved differences in humans when the "sports" appear not to be absolutely necessary. Caucasians do not need the complex narrow nasal system to survive in very cold conditions such as ice ages. Black people live happily in Alaska when their facial structure is designed to breath in the thin air of a hot climate, again not really needed.
Black skin is good protection from the damaging rays of the sun. However, mainly white older adults die of skin cancer in Australia not younger people in the prime of species reproduction. Unless those under 20 years of age actually die from a particular trait there is no need to change to a new variant. It must be noted that until a hundred years ago most had children when they were under 20.
Some things such as dimples do not serve any purpose. They continue in some by genetic inheritance. This is a dominant feature and parents pass it on to their children. Earlobe attachment is spread across the board with direct attachment to head, in between and detached. It seems though that being dark or fair and nasal structure do serve a purpose.
An unusual trait is left handedness. It occurs in less than 25% of the population on earth. As many as 100 genes "cause" this. Some cultures force those born with the disposition to make their right hand dominant in life.
Hunting animals tend to be color blind so they can perceive depth. Humans evolved to see colors to read facial expressions. Eight percent of men and 1 in 200 women do not see color. To say that the we are a perplexing animal is an understatement.
An unusual trait is left handedness. It occurs in less than 25% of the population on earth. As many as 100 genes "cause" this. Some cultures force those born with the disposition to make their right hand dominant in life.
Hunting animals tend to be color blind so they can perceive depth. Humans evolved to see colors to read facial expressions. Eight percent of men and 1 in 200 women do not see color. To say that the we are a perplexing animal is an understatement.
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